Type Oceanographic cruise
Ship Pourquoi pas ?
Ship owner Ifremer
Dates 13/08/2012 - 20/09/2012
Chief scientist(s) ASLANIAN Daniel ORCID, MOULIN Maryline ORCID, SCHNURLE Philippe ORCID



Technopôle Brest-Iroise

Place Nicolas Copernic

29280 Plouzané

DOI 10.17600/12030090

The Equatorial Atlantic Ocean, extending over 2,000km, can be divided into 3 large 600-800km segments which are separated by major fracture zones (Ascension, Chain, São Paulo, Romanche and Sierra Leone). The aim of the MAGIC (acronym for Margins of brAzil, Ghana and Ivory Coast) project is to study the segment II (between the FZ of Romanche and São Paulo), and more specifically the Para-Maranhão-Barreirinhas-Ceara system and the Ivory Coast (Cote d'Ivoire) - Ghana margins. The proposal is to obtain complete cross-sections of this system, on the Brazilian side to begin with, to construct 3D imagery of its deep structure and test different hypotheses about: 1) the nature of the crust in the transition zone (between the continent-ocean boundary and fit). Why is it already thinned? Is this 20km crust made up purely of an upper crust? Is exhumed mantle present? 2) the position of the oceanic crust. When did the contact between the oceanic and continental/transitional crusts take place along the Romanche and São Paulo fracture zones? What are the consequences on subsidence? 3) subsidence (by modelling) 4) 3D deep evolution of the Ceara-Maranhão-Para system (with its conjugate margin, i.e. the Côte d'Ivoire-Ghana margin) in comparison with other margin systems 5) rifting models in oblique extension systems. The related project is MAGIC.

Data managed by SISMER